Sleep research article
Is self-report brain fog after mild COVID-19 truly induced by COVID-19 infection? A longitudinal fNIRS study.
Authors: Ding Q , Wu C , Ou ZT , Yao ST , Zhang L , Lan Y , Xu GQ
One-line summary
A sleep science research article on Is self-report brain fog after mild COVID-19 truly induced by COVID-19 infection? A longitudinal fNIRS study..
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中文解读
中文解读待补充：本站会优先为失眠研究、睡眠质量改善、昼夜节律等高价值睡眠研究添加中文说明。
Original abstract
<h4>Introduction</h4>Brain fog (i.e., subjective cognitive deficits) is one of the most common long-lasting symptoms post-COVID-19. Cognitive deficits and psychological factors (such as depression) are possible causes of brain fog. This study is to determine whether brain fog post-COVID-19 results from cognitive deficits or depression induced by COVID-19 infection.<h4>Methods</h4>We implemented psychological (depression scale) and behavioural measures (dual task: subtraction while walking) with simultaneous functional near-infrared spectroscopy (fNIRS) recording in 25 healthy young adults pre-, 3, 7 and 14 weeks post-COVID-19. Depression level, dual task performance and fNIRS results were compared among sessions. The relationships between brain fog severity, depression and dual task performance were assessed.<h4>Results</h4>Depression level and dual task performance remained unchanged post-COVID-19. Brain fog severity was positively correlated depression at all sessions (<i>p</i>'<i>s</i> < 0.05). Brain activation was significantly reduced at all sessions post-COVID-19 (<i>p</i>'<i>s</i> < 0.001), while global efficiency was significantly reduced at 7 weeks post-COVID-19 (<i>p</i> = 0.003). Changes in left somatosensory and motor cortices activation were inversely correlated with changes in walking cost (<i>p</i>'<i>s</i> = 0.005 and 0.007, respectively), while changes in global efficiency were associated with changes in walking cost (<i>p</i> = 0.006) from pre- to 7 weeks post-COVID-19.<h4>Conclusions</h4>Mild COVID-19 infection does not lead to apparent cognitive deficits or depression, although brain activation and global efficiency are reduced post-COVID-19. Brain fog is likely to result from depression rather than cognitive deficits induced by COVID-19. People should pay attention to their psychological states during COVID-19 pandemic.
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